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[79.124.17.100]) by mx.google.com with ESMTP id u21-20020a50a415000000b0056c498c9905si4717446edb.102.2024.04.01.14.32.27; Mon, 01 Apr 2024 14:32:28 -0700 (PDT) Received-SPF: pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) client-ip=79.124.17.100; Authentication-Results: mx.google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id BA12B68CF96; Tue, 2 Apr 2024 00:32:24 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 4E40868BDE1 for ; Tue, 2 Apr 2024 00:32:18 +0300 (EEST) Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-1e0b5e79a57so34683755ad.2 for ; Mon, 01 Apr 2024 14:32:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712007136; x=1712611936; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ci3fya2ORsBH4nJRyhQ6rp6AO2L5ECKoW83Vk7dorbM=; b=nhdhdEDJ3ktS1bnDvHP1cFhuhRUgALKyreINopugZK+mQ2UJH4nV/uUPY9tEYzDOHH MPJaEWMJDdYpvEc7R48hBK+keNR/eQKMamhdYK8y9R1k9Arpm8LKzp0TqeokJDOQZenv k5VjLwgZltzZ3KdWmB0wXYPyKFYY4sfXLwKXZl/ayNxxN/rroJ+UUTdXbS6PT84Q4uMs wYMjSSMMFpOpv6qy7+QfpfX4YOCpdSKPwSVkRCaUsBiUtYLT1SuSz2wTHNpr6qT24HFa cB/C8o+iO/K/Sb9q94JB0nX4bqWn7cn2LI6w2TQqk7GL2mE3RwWPBLqLkvIE+jB1VOsh fKqg== X-Gm-Message-State: AOJu0Yz1B/0aoi/cR9EzrWhRnYW9lWiNOYv/DstUnXmdc+W1yaX8pY7W 2opKuljg6l+CrVsGtjUgYV2hXje52MBRJvfDmY4yMISoFMiiQpOIH6SMrY6+t+7+C/2+nNGCuwB TvpY0DjjTijkuOAf6nGK4nRYOMbk10nXh+RCJY5kf7s7TAmwp8k2ukys7vspWkl+Y8GJO6j4bbd tR8AApLSvnp8EqpRBGSmHVhJCZU6EDq8yUwttCVlfCQL/6 X-Received: from asoulier-us.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:f79]) (user=asoulier job=sendgmr) by 2002:a17:902:d4cc:b0:1de:3f08:d740 with SMTP id o12-20020a170902d4cc00b001de3f08d740mr143475plg.12.1712007135983; Mon, 01 Apr 2024 14:32:15 -0700 (PDT) Date: Mon, 1 Apr 2024 21:32:04 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.44.0.478.gd926399ef9-goog Message-ID: <20240401213205.2039901-1-asoulier@google.com> To: ffmpeg-devel@ffmpeg.org Subject: [FFmpeg-devel] [PATCH 1/2] avcodec/liblc3: Add encoding/decoding support of LC3 audio codec X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Antoine Soulier via ffmpeg-devel From: Antoine Soulier Reply-To: FFmpeg development discussions and patches Cc: Antoine Soulier Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: 4XGNrBStNVle The LC3 audio codec is the default codec of Bluetooth LE audio. This is a wrapper over the liblc3 library (https://github.com/google/liblc3). Signed-off-by: Antoine Soulier --- Changelog | 4 + configure | 6 ++ doc/encoders.texi | 57 +++++++++++ doc/general_contents.texi | 11 +- libavcodec/Makefile | 2 + libavcodec/allcodecs.c | 2 + libavcodec/codec_desc.c | 7 ++ libavcodec/codec_id.h | 1 + libavcodec/liblc3dec.c | 145 ++++++++++++++++++++++++++ libavcodec/liblc3enc.c | 210 ++++++++++++++++++++++++++++++++++++++ 10 files changed, 444 insertions(+), 1 deletion(-) create mode 100644 libavcodec/liblc3dec.c create mode 100644 libavcodec/liblc3enc.c diff --git a/Changelog b/Changelog index e83a00e35c..83a4cf7888 100644 --- a/Changelog +++ b/Changelog @@ -1,6 +1,10 @@ Entries are sorted chronologically from oldest to youngest within each release, releases are sorted from youngest to oldest. +version : +- LC3/LC3plus decoding/encoding using external library liblc3 + + version 7.0: - DXV DXT1 encoder - LEAD MCMP decoder diff --git a/configure b/configure index 2d46ef0b9c..e5d9ba9f53 100755 --- a/configure +++ b/configure @@ -244,6 +244,7 @@ External library support: --enable-libjxl enable JPEG XL de/encoding via libjxl [no] --enable-libklvanc enable Kernel Labs VANC processing [no] --enable-libkvazaar enable HEVC encoding via libkvazaar [no] + --enable-liblc3 enable LC3 de/encoding via liblc3 [no] --enable-liblensfun enable lensfun lens correction [no] --enable-libmodplug enable ModPlug via libmodplug [no] --enable-libmp3lame enable MP3 encoding via libmp3lame [no] @@ -1926,6 +1927,7 @@ EXTERNAL_LIBRARY_LIST=" libjxl libklvanc libkvazaar + liblc3 libmodplug libmp3lame libmysofa @@ -3499,6 +3501,9 @@ libilbc_encoder_deps="libilbc" libjxl_decoder_deps="libjxl libjxl_threads" libjxl_encoder_deps="libjxl libjxl_threads" libkvazaar_encoder_deps="libkvazaar" +liblc3_decoder_deps="liblc3" +liblc3_encoder_deps="liblc3" +liblc3_encoder_select="audio_frame_queue" libmodplug_demuxer_deps="libmodplug" libmp3lame_encoder_deps="libmp3lame" libmp3lame_encoder_select="audio_frame_queue mpegaudioheader" @@ -6869,6 +6874,7 @@ enabled libjxl && require_pkg_config libjxl "libjxl >= 0.7.0" jxl/dec require_pkg_config libjxl_threads "libjxl_threads >= 0.7.0" jxl/thread_parallel_runner.h JxlThreadParallelRunner enabled libklvanc && require libklvanc libklvanc/vanc.h klvanc_context_create -lklvanc enabled libkvazaar && require_pkg_config libkvazaar "kvazaar >= 2.0.0" kvazaar.h kvz_api_get +enabled liblc3 && require_pkg_config liblc3 "lc3 >= 1.1.0" lc3.h lc3_hr_setup_encoder enabled liblensfun && require_pkg_config liblensfun lensfun lensfun.h lf_db_create if enabled libmfx && enabled libvpl; then diff --git a/doc/encoders.texi b/doc/encoders.texi index 7c223ed74c..66847191e1 100644 --- a/doc/encoders.texi +++ b/doc/encoders.texi @@ -814,6 +814,63 @@ ffmpeg -i input.wav -c:a libfdk_aac -profile:a aac_he -b:a 64k output.m4a @end example @end itemize +@anchor{liblc3-enc} +@section liblc3 + +liblc3 LC3 (Low Complexity Communication Codec) encoder wrapper. + +Requires the presence of the liblc3 headers and library during configuration. +You need to explicitly configure the build with @code{--enable-liblc3}. + +This encoder has support for the Bluetooth SIG LC3 codec for the LE Audio +protocol, and the following features of LC3plus: +@itemize +@item +Frame duration of 2.5 and 5ms. +@item +High-Resolution mode, 48 KHz, and 96 kHz sampling rates. +@end itemize + +For more information see the liblc3 project at +@url{https://github.com/google/liblc3}. + +@subsection Options + +The following options are mapped on the shared FFmpeg codec options. + +@table @option +@item b @var{bitrate} +Set the bit rate in bits/s. This will determine the fixed size of the encoded +frames, for a selected frame duration. + +@item ar @var{frequency} +Set the audio sampling rate (in Hz). + +@item channels +Set the number of audio channels. + +@item frame_duration +Set the audio frame duration in milliseconds. Default value is 10ms. +Allowed frame durations are 2.5ms, 5ms, 7.5ms and 10ms. +LC3 (Bluetooth LE Audio), allows 7.5ms and 10ms; and LC3plus 2.5ms, 5ms +and 10ms. + +The 10ms frame duration is available in LC3 and LC3 plus standard. +In this mode, the produced bitstream can be referenced either as LC3 or LC3plus. + +@item high_resolution @var{boolean} +Enable the high-resolution mode if set to 1. The high-resolution mode is +available with all LC3plus frame durations and for a sampling rate of 48 KHz, +and 96 KHz. + +The encoder automatically turns off this mode at lower sampling rates and +activates it at 96 KHz. + +This mode should be preferred at high bitrates. In this mode, the audio +bandwidth is always up to the Nyquist frequency, compared to LC3 at 48 KHz, +which limits the bandwidth to 20 KHz. +@end table + @anchor{libmp3lame} @section libmp3lame diff --git a/doc/general_contents.texi b/doc/general_contents.texi index f269cbd1a9..e7cf4f8239 100644 --- a/doc/general_contents.texi +++ b/doc/general_contents.texi @@ -237,6 +237,14 @@ Go to @url{http://sourceforge.net/projects/opencore-amr/} and follow the instructions for installing the library. Then pass @code{--enable-libfdk-aac} to configure to enable it. +@subsection LC3 library + +FFmpeg can make use of the Google LC3 library for LC3 decoding & encoding. + +Go to @url{https://github.com/google/liblc3/} and follow the instructions for +installing the library. +Then pass @code{--enable-liblc3} to configure to enable it. + @section OpenH264 FFmpeg can make use of the OpenH264 library for H.264 decoding and encoding. @@ -1300,7 +1308,8 @@ following image formats are supported: @tab encoding and decoding supported through external library libilbc @item IMC (Intel Music Coder) @tab @tab X @item Interplay ACM @tab @tab X -@item MACE (Macintosh Audio Compression/Expansion) 3:1 @tab @tab X +@item LC3 @tab E @tab E + @tab supported through external library liblc3 @item MACE (Macintosh Audio Compression/Expansion) 6:1 @tab @tab X @item Marian's A-pac audio @tab @tab X @item MI-SC4 (Micronas SC-4 Audio) @tab @tab X diff --git a/libavcodec/Makefile b/libavcodec/Makefile index eef936944d..6323c98add 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -1122,6 +1122,8 @@ OBJS-$(CONFIG_LIBILBC_ENCODER) += libilbc.o OBJS-$(CONFIG_LIBJXL_DECODER) += libjxldec.o libjxl.o OBJS-$(CONFIG_LIBJXL_ENCODER) += libjxlenc.o libjxl.o OBJS-$(CONFIG_LIBKVAZAAR_ENCODER) += libkvazaar.o +OBJS-$(CONFIG_LIBLC3_ENCODER) += liblc3enc.o +OBJS-$(CONFIG_LIBLC3_DECODER) += liblc3dec.o OBJS-$(CONFIG_LIBMP3LAME_ENCODER) += libmp3lame.o OBJS-$(CONFIG_LIBOPENCORE_AMRNB_DECODER) += libopencore-amr.o OBJS-$(CONFIG_LIBOPENCORE_AMRNB_ENCODER) += libopencore-amr.o diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index 2386b450a6..f4705651fb 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -776,6 +776,8 @@ extern const FFCodec ff_libilbc_encoder; extern const FFCodec ff_libilbc_decoder; extern const FFCodec ff_libjxl_decoder; extern const FFCodec ff_libjxl_encoder; +extern const FFCodec ff_liblc3_encoder; +extern const FFCodec ff_liblc3_decoder; extern const FFCodec ff_libmp3lame_encoder; extern const FFCodec ff_libopencore_amrnb_encoder; extern const FFCodec ff_libopencore_amrnb_decoder; diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c index 3bab86db62..7dba61dc8b 100644 --- a/libavcodec/codec_desc.c +++ b/libavcodec/codec_desc.c @@ -3425,6 +3425,13 @@ static const AVCodecDescriptor codec_descriptors[] = { .long_name = NULL_IF_CONFIG_SMALL("QOA (Quite OK Audio)"), .props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY, }, + { + .id = AV_CODEC_ID_LC3, + .type = AVMEDIA_TYPE_AUDIO, + .name = "lc3", + .long_name = NULL_IF_CONFIG_SMALL("LC3 (Low Complexity Communication Codec)"), + .props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY, + }, /* subtitle codecs */ { diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h index c8dc21da74..0ab1e34a61 100644 --- a/libavcodec/codec_id.h +++ b/libavcodec/codec_id.h @@ -543,6 +543,7 @@ enum AVCodecID { AV_CODEC_ID_AC4, AV_CODEC_ID_OSQ, AV_CODEC_ID_QOA, + AV_CODEC_ID_LC3, /* subtitle codecs */ AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs. diff --git a/libavcodec/liblc3dec.c b/libavcodec/liblc3dec.c new file mode 100644 index 0000000000..75ab90f377 --- /dev/null +++ b/libavcodec/liblc3dec.c @@ -0,0 +1,145 @@ +/* + * LC3 decoder wrapper + * Copyright (C) 2024 Antoine Soulier + * + * This file is part of FFmpeg. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include + +#include "libavutil/intreadwrite.h" + +#include "avcodec.h" +#include "codec.h" +#include "codec_internal.h" +#include "decode.h" +#include "internal.h" + +#define DECODER_MAX_CHANNELS 2 + +typedef struct LibLC3DecContext { + int frame_us, srate_hz, hr_mode; + void *decoder_mem; + lc3_decoder_t decoder[DECODER_MAX_CHANNELS]; + int64_t length; +} LibLC3DecContext; + +static av_cold int liblc3_decode_init(AVCodecContext *avctx) +{ + LibLC3DecContext *liblc3 = avctx->priv_data; + int channels = avctx->ch_layout.nb_channels; + int ep_mode; + unsigned decoder_size; + + if (avctx->extradata_size < 10) + return AVERROR_INVALIDDATA; + + liblc3->frame_us = AV_RL16(avctx->extradata + 0) * 10; + liblc3->srate_hz = avctx->sample_rate; + ep_mode = AV_RL16(avctx->extradata + 2); + liblc3->hr_mode = AV_RL16(avctx->extradata + 4); + liblc3->length = AV_RL32(avctx->extradata + 6); + if (ep_mode != 0) { + av_log(avctx, AV_LOG_ERROR, + "Error protection mode is not supported.\n"); + return AVERROR(EINVAL); + } + + av_log(avctx, AV_LOG_INFO, + "Decoding %.1f ms frames.\n", liblc3->frame_us / 1000.f); + if (liblc3->hr_mode) + av_log(avctx, AV_LOG_INFO, "High-resolution mode enabled.\n"); + + decoder_size = lc3_hr_decoder_size( + liblc3->hr_mode, liblc3->frame_us, liblc3->srate_hz); + if (!decoder_size) + return AVERROR_INVALIDDATA; + + liblc3->decoder_mem = av_malloc_array(channels, decoder_size); + if (!liblc3->decoder_mem) + return AVERROR(ENOMEM); + + for (int ch = 0; ch < channels; ch++) { + liblc3->decoder[ch] = lc3_hr_setup_decoder( + liblc3->hr_mode, liblc3->frame_us, liblc3->srate_hz, 0, + (char *)liblc3->decoder_mem + ch * decoder_size); + } + + avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; + avctx->delay = lc3_hr_delay_samples( + liblc3->hr_mode, liblc3->frame_us, liblc3->srate_hz); + avctx->internal->skip_samples = avctx->delay; + + return 0; +} + +static av_cold int liblc3_decode_close(AVCodecContext *avctx) +{ + LibLC3DecContext *liblc3 = avctx->priv_data; + + av_freep(&liblc3->decoder_mem); + + return 0; +} + +static int liblc3_decode(AVCodecContext *avctx, AVFrame *frame, + int *got_frame_ptr, AVPacket *avpkt) +{ + LibLC3DecContext *liblc3 = avctx->priv_data; + int channels = avctx->ch_layout.nb_channels; + uint8_t *in = avpkt->data; + int block_bytes, ret; + + frame->nb_samples = av_rescale( + liblc3->frame_us, liblc3->srate_hz, 1000*1000); + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + + block_bytes = avpkt->size; + for (int ch = 0; ch < channels; ch++) { + int nbytes = block_bytes / channels + (ch < block_bytes % channels); + + ret = lc3_decode(liblc3->decoder[ch], in, nbytes, + LC3_PCM_FORMAT_FLOAT, frame->data[ch], 1); + if (ret < 0) + return AVERROR_INVALIDDATA; + + in += nbytes; + } + + if (liblc3->length > 0) { + int64_t end_pts = liblc3->length + avctx->delay; + frame->nb_samples = FFMIN(frame->nb_samples, + FFMAX(end_pts - frame->pts, 0)); + } + + *got_frame_ptr = 1; + + return avpkt->size; +} + +const FFCodec ff_liblc3_decoder = { + .p.name = "liblc3", + CODEC_LONG_NAME("LC3 (Low Complexity Communication Codec)"), + .p.type = AVMEDIA_TYPE_AUDIO, + .p.id = AV_CODEC_ID_LC3, + .p.capabilities = AV_CODEC_CAP_DR1, + .p.wrapper_name = "liblc3", + .priv_data_size = sizeof(LibLC3DecContext), + .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, + .init = liblc3_decode_init, + .close = liblc3_decode_close, + FF_CODEC_DECODE_CB(liblc3_decode), +}; diff --git a/libavcodec/liblc3enc.c b/libavcodec/liblc3enc.c new file mode 100644 index 0000000000..9731229e50 --- /dev/null +++ b/libavcodec/liblc3enc.c @@ -0,0 +1,210 @@ +/* + * LC3 encoder wrapper + * Copyright (C) 2024 Antoine Soulier + * + * This file is part of FFmpeg. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include + +#include "libavutil/intreadwrite.h" +#include "libavutil/opt.h" + +#include "avcodec.h" +#include "codec.h" +#include "codec_internal.h" +#include "encode.h" + +#define ENCODER_MAX_CHANNELS 2 + +typedef struct LibLC3EncOpts { + float frame_duration; + int hr_mode; +} LibLC3EncOpts; + +typedef struct LibLC3EncContext { + const AVClass *av_class; + LibLC3EncOpts opts; + int block_bytes; + void *encoder_mem; + lc3_encoder_t encoder[ENCODER_MAX_CHANNELS]; + int delay_samples; + int remaining_samples; +} LibLC3EncContext; + +static av_cold int liblc3_encode_init(AVCodecContext *avctx) +{ + LibLC3EncContext *liblc3 = avctx->priv_data; + bool hr_mode = liblc3->opts.hr_mode; + int frame_us = liblc3->opts.frame_duration * 1000; + int srate_hz = avctx->sample_rate; + int channels = avctx->ch_layout.nb_channels; + int effective_bit_rate; + unsigned encoder_size; + + if (frame_us != 2500 && frame_us != 5000 && + frame_us != 7500 && frame_us != 10000 ) { + av_log(avctx, AV_LOG_ERROR, + "Unsupported frame duration %.1f ms.\n", frame_us / 1000.f); + return AVERROR(EINVAL); + } + + hr_mode |= srate_hz > 48000; + hr_mode &= srate_hz >= 48000; + + if (frame_us == 7500 && hr_mode) { + av_log(avctx, AV_LOG_ERROR, + "High-resolution mode is not supported with 7.5 ms frames.\n"); + return AVERROR(EINVAL); + } + + av_log(avctx, AV_LOG_INFO, "Encoding %.1f ms frames.\n", frame_us / 1000.f); + if (hr_mode) + av_log(avctx, AV_LOG_INFO, "High-resolution mode is enabled.\n"); + + liblc3->block_bytes = lc3_hr_frame_block_bytes( + hr_mode, frame_us, srate_hz, channels, avctx->bit_rate); + + effective_bit_rate = lc3_hr_resolve_bitrate( + hr_mode, frame_us, srate_hz, liblc3->block_bytes); + + if (avctx->bit_rate != effective_bit_rate) + av_log(avctx, AV_LOG_WARNING, + "Bitrate changed to %d bps.\n", effective_bit_rate); + avctx->bit_rate = effective_bit_rate; + + encoder_size = lc3_hr_encoder_size(hr_mode, frame_us, srate_hz); + if (!encoder_size) + return AVERROR(EINVAL); + + liblc3->encoder_mem = av_malloc_array(channels, encoder_size); + if (!liblc3->encoder_mem) + return AVERROR(ENOMEM); + + for (int ch = 0; ch < channels; ch++) { + liblc3->encoder[ch] = lc3_hr_setup_encoder( + hr_mode, frame_us, srate_hz, 0, + (char *)liblc3->encoder_mem + ch * encoder_size); + } + + avctx->extradata = av_mallocz(6 + AV_INPUT_BUFFER_PADDING_SIZE); + if (!avctx->extradata) + return AVERROR(ENOMEM); + + AV_WL16(avctx->extradata + 0, frame_us / 10); + AV_WL16(avctx->extradata + 2, 0); + AV_WL16(avctx->extradata + 4, hr_mode); + avctx->extradata_size = 6; + + avctx->frame_size = av_rescale(frame_us, srate_hz, 1000*1000); + liblc3->delay_samples = lc3_hr_delay_samples(hr_mode, frame_us, srate_hz); + liblc3->remaining_samples = 0; + + return 0; +} + +static av_cold int liblc3_encode_close(AVCodecContext *avctx) +{ + LibLC3EncContext *liblc3 = avctx->priv_data; + + av_freep(&liblc3->encoder_mem); + + return 0; +} + +static int liblc3_encode(AVCodecContext *avctx, AVPacket *pkt, + const AVFrame *frame, int *got_packet_ptr) +{ + LibLC3EncContext *liblc3 = avctx->priv_data; + int block_bytes = liblc3->block_bytes; + int channels = avctx->ch_layout.nb_channels; + void *zero_frame = NULL; + uint8_t *data_ptr; + int ret; + + if ((ret = ff_get_encode_buffer(avctx, pkt, block_bytes, 0)) < 0) + return ret; + + if (frame) { + int padding = frame->nb_samples - frame->duration; + liblc3->remaining_samples = FFMAX(liblc3->delay_samples - padding, 0); + } else { + if (!liblc3->remaining_samples) + return 0; + + liblc3->remaining_samples = 0; + zero_frame = av_mallocz(avctx->frame_size * sizeof(float)); + if (!zero_frame) + return AVERROR(ENOMEM); + } + + data_ptr = pkt->data; + for (int ch = 0; ch < channels; ch++) { + const float *pcm = zero_frame ? zero_frame : frame->data[ch]; + int nbytes = block_bytes / channels + (ch < block_bytes % channels); + + lc3_encode(liblc3->encoder[ch], + LC3_PCM_FORMAT_FLOAT, pcm, 1, nbytes, data_ptr); + + data_ptr += nbytes; + } + + if (zero_frame) + av_free(zero_frame); + + *got_packet_ptr = 1; + + return 0; +} + +#define OFFSET(x) offsetof(LibLC3EncContext, opts.x) +#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM +static const AVOption options[] = { + { "frame_duration", "Duration of a frame in milliseconds", + OFFSET(frame_duration), AV_OPT_TYPE_FLOAT, + { .dbl = 10.0 }, 2.5, 10.0, FLAGS }, + { "high_resolution", "Enable High-Resolution mode (48 KHz or 96 KHz)", + OFFSET(hr_mode), AV_OPT_TYPE_BOOL, + { .i64 = 0 }, 0, 1, FLAGS }, + { NULL } +}; + +static const AVClass class = { + .class_name = "liblc3 encoder", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +const FFCodec ff_liblc3_encoder = { + .p.name = "liblc3", + CODEC_LONG_NAME("LC3 (Low Complexity Communication Codec)"), + .p.type = AVMEDIA_TYPE_AUDIO, + .p.id = AV_CODEC_ID_LC3, + .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY, + .p.ch_layouts = (const AVChannelLayout[]) + { { AV_CHANNEL_ORDER_UNSPEC, 1 }, + { AV_CHANNEL_ORDER_UNSPEC, 2 }, { 0 } }, + .p.supported_samplerates = (const int []) + { 96000, 48000, 32000, 24000, 16000, 8000, 0 }, + .p.sample_fmts = (const enum AVSampleFormat[]) + { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE }, + .p.priv_class = &class, + .p.wrapper_name = "liblc3", + .priv_data_size = sizeof(LibLC3EncContext), + .init = liblc3_encode_init, + .close = liblc3_encode_close, + FF_CODEC_ENCODE_CB(liblc3_encode), +}; From patchwork Mon Apr 1 21:32:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Antoine Soulier X-Patchwork-Id: 47709 Delivered-To: ffmpegpatchwork2@gmail.com Received: by 2002:a05:6a20:9f96:b0:1a3:b6bb:3029 with SMTP id mm22csp994858pzb; Mon, 1 Apr 2024 14:32:37 -0700 (PDT) X-Forwarded-Encrypted: i=2; AJvYcCWxx4diwiK8V9C07YKGeiadDvkfFtTzMQIAzhuOSmomdRQwZxzKrdJZmflMZUXkIwC+KWVPrGQHzcyi51ZRqbVwD+s+i9E1RS3/Lg== X-Google-Smtp-Source: AGHT+IGPej4n+jRehzeJuIumWbwF7nKt2BGULlmo2j1xQKNwf21CT6+39W5OXsOjztGIQRcgUj0J X-Received: by 2002:a05:6512:3d0a:b0:516:1a1e:164f with SMTP id d10-20020a0565123d0a00b005161a1e164fmr7989124lfv.41.1712007156902; Mon, 01 Apr 2024 14:32:36 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1712007156; cv=none; d=google.com; s=arc-20160816; b=JtdPoNf3ossYCSJGH6VcBj68p30TVTxUUxX0qMuMHanNRE+Win5b/8BwhnYD9z99o5 CC0dpDI7TKv/zhB0GxswEwi0eUirX7OGaJtdcaLR5q3hQ4Ejcjscuq4o+WRBhxcG4j06 Y0DFofcX31ysLgoO4rZESGhpaYVDTu+pxkeYeJ49/3qc5Svw+P/IpEtgBOMVIbReUHxw e7QBpZyNsNnSQytEcdDIxoRw+YQp+4Yd1IWXwcBRks85eNxzH97KIjxJtXyvxt9W2oUd 5aYJ6OZDb4tvI+CSJZqrGb15qNelLTrN5T3H4x7VHT+BUF6bzRr3jpb/+iCH+eVyjyEf yWOQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:content-transfer-encoding:cc:reply-to:from :list-subscribe:list-help:list-post:list-archive:list-unsubscribe :list-id:precedence:subject:to:message-id:references:mime-version :in-reply-to:date:delivered-to; bh=+mERkasUw5nn7YZvnCBL0sNKhOyQ+mOPvD/Yf04LbEU=; fh=eZJQwGgFNmhG1aNRPvwNmWJ7Br90d3O+ZTyD+wYtFmA=; b=U0PUMRC8YmqNeN3i1KBrxGkXljkww2wtGGm4Jv/woDJUDZ+lETdhf3NWTk4Zw1r1GG td1DCUIZe/AJ1JY0w+CmWcJ4+jnXxx56Chn0muq6TrG5bO86XtN/XmQNmmzBsMk+zPA5 SZDxBkcrA5/2vnd5Fw9MjsnZjSdRqiiivFaS/Rlf5ILIwGr7NOKLVsN/0DmEtVmavKpX kHLA7Uv2kRagNLabfgaag0nwsTvcll63GvJQHVVF6SWQt9jDsjE5LTLKHThbV7qgYdhS LkvGJJ90jDsWtsSzxXxvTT/Y3qenI4OQWg/h9jv+lss/2fpWj40+eft097Dwxvz4gWDO LtFQ==; dara=google.com ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org. [79.124.17.100]) by mx.google.com with ESMTP id v20-20020a509554000000b0056c2b47f270si4961526eda.487.2024.04.01.14.32.36; Mon, 01 Apr 2024 14:32:36 -0700 (PDT) Received-SPF: pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) client-ip=79.124.17.100; Authentication-Results: mx.google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id C530F68CFEC; Tue, 2 Apr 2024 00:32:25 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 03AB468CF98 for ; Tue, 2 Apr 2024 00:32:19 +0300 (EEST) Received: by mail-pg1-f201.google.com with SMTP id 41be03b00d2f7-5e4df21f22dso3430729a12.0 for ; Mon, 01 Apr 2024 14:32:19 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712007138; x=1712611938; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Z8U2Kmb+ua9o/kZJi6R8rqT8DJrQAsMTJFoMlnV70OI=; b=PI0X3aYNtjgj9k1AQOEuZjI8JrTH1dd1kKAhN5yaIzn7jQnSmfnvZB8TZPSNSTzTa7 nkHI/NpRSnUyMu/BtwCAX1hYeysTKR8Y/VTyKFHLj1bcD6UQjpE/lUyP+7mSyUnwFv2x kfdXyo9XTgSTsNQs9FIIMitbBCc3Pq5MQAidBHyEqNp32Q64Na2zZdDy+BmquePCTyRs Kkh7uemhF2nWvPvVjs9KexgVH+3i5GT0bz7c7ahp/cxvRfACCcaDN0j9ifJEQ8Py1ZRL +ls/ArbNr+b+TRVwRaong9bAt7tscdFb/FwvzxVudE/8XwsWviF3ghwxEBKC4e0DOD48 oJHg== X-Gm-Message-State: AOJu0YyHGm4U1c8Ur6BlOtRQM80VEttfuSsuPSDvsYAm8HFElD2CMtb3 Zz8QrxNuvURDABnD5cXOee1cTSiEt0ytxQdn9NmC8XBWfe0Svcd+jP5A6M5HIwxG4WOFsTW5KSu BUwXr4Jio6hEcAgkdCxGoEYsdOslUYI5nfOpLtWEp9IxVuLKCB37ZDndFq7KJJ4w8ye6MXSBEJ9 /mRIyCX2gZvWRh4XiiqixeooeVoA7bC4sDHRp2FDVy7hCX X-Received: from asoulier-us.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:f79]) (user=asoulier job=sendgmr) by 2002:a65:4187:0:b0:5dc:1293:c86 with SMTP id a7-20020a654187000000b005dc12930c86mr34080pgq.6.1712007137869; Mon, 01 Apr 2024 14:32:17 -0700 (PDT) Date: Mon, 1 Apr 2024 21:32:05 +0000 In-Reply-To: <20240401213205.2039901-1-asoulier@google.com> Mime-Version: 1.0 References: <20240401213205.2039901-1-asoulier@google.com> X-Mailer: git-send-email 2.44.0.478.gd926399ef9-goog Message-ID: <20240401213205.2039901-2-asoulier@google.com> To: ffmpeg-devel@ffmpeg.org Subject: [FFmpeg-devel] [PATCH 2/2] avformat/lc3: Add file format for LC3/LC3plus transport X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Antoine Soulier via ffmpeg-devel From: Antoine Soulier Reply-To: FFmpeg development discussions and patches Cc: Antoine Soulier Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: 1PC+5q1rA+v9 A file format is described in Bluetooth SIG LC3 and ETSI TS 103 634, for test purpose. This is the format implemented here. Signed-off-by: Antoine Soulier --- Changelog | 1 + doc/muxers.texi | 6 ++ libavformat/Makefile | 2 + libavformat/allformats.c | 2 + libavformat/lc3dec.c | 127 +++++++++++++++++++++++++++++++++++++++ libavformat/lc3enc.c | 100 ++++++++++++++++++++++++++++++ 6 files changed, 238 insertions(+) create mode 100644 libavformat/lc3dec.c create mode 100644 libavformat/lc3enc.c diff --git a/Changelog b/Changelog index 83a4cf7888..08c200a41d 100644 --- a/Changelog +++ b/Changelog @@ -2,6 +2,7 @@ Entries are sorted chronologically from oldest to youngest within each release, releases are sorted from youngest to oldest. version : +- LC3/LC3plus demuxer and muxer - LC3/LC3plus decoding/encoding using external library liblc3 diff --git a/doc/muxers.texi b/doc/muxers.texi index a10a8e216f..9687746c30 100644 --- a/doc/muxers.texi +++ b/doc/muxers.texi @@ -2612,6 +2612,12 @@ WebDAV server every second: ffmpeg -f x11grab -framerate 1 -i :0.0 -q:v 6 -update 1 -protocol_opts method=PUT http://example.com/desktop.jpg @end example +@section lc3 +Bluetooth SIG Low Complexity Communication Codec audio (LC3), or +ETSI TS 103 634 Low Complexity Communication Codec plus (LC3plus). + +This muxer accepts a single @code{lc3} audio stream. + @section matroska Matroska container muxer. diff --git a/libavformat/Makefile b/libavformat/Makefile index 44aa485029..4961c42852 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -332,6 +332,8 @@ OBJS-$(CONFIG_KVAG_DEMUXER) += kvag.o OBJS-$(CONFIG_KVAG_MUXER) += kvag.o rawenc.o OBJS-$(CONFIG_LAF_DEMUXER) += lafdec.o OBJS-$(CONFIG_LATM_MUXER) += latmenc.o rawenc.o +OBJS-$(CONFIG_LC3_DEMUXER) += lc3dec.o +OBJS-$(CONFIG_LC3_MUXER) += lc3enc.o OBJS-$(CONFIG_LMLM4_DEMUXER) += lmlm4.o OBJS-$(CONFIG_LOAS_DEMUXER) += loasdec.o rawdec.o OBJS-$(CONFIG_LUODAT_DEMUXER) += luodatdec.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index 9df42bb87a..0b36a7c3eb 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -252,6 +252,8 @@ extern const FFInputFormat ff_kvag_demuxer; extern const FFOutputFormat ff_kvag_muxer; extern const FFInputFormat ff_laf_demuxer; extern const FFOutputFormat ff_latm_muxer; +extern const FFInputFormat ff_lc3_demuxer; +extern const FFOutputFormat ff_lc3_muxer; extern const FFInputFormat ff_lmlm4_demuxer; extern const FFInputFormat ff_loas_demuxer; extern const FFInputFormat ff_luodat_demuxer; diff --git a/libavformat/lc3dec.c b/libavformat/lc3dec.c new file mode 100644 index 0000000000..7232e9847e --- /dev/null +++ b/libavformat/lc3dec.c @@ -0,0 +1,127 @@ +/* + * LC3 demuxer + * Copyright (C) 2024 Antoine Soulier + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Based on the file format specified by : + * + * - Bluetooth SIG - Low Complexity Communication Codec Test Suite + * https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=502301 + * 3.2.8.2 Reference LC3 Codec Bitstream Format + * + * - ETSI TI 103 634 V1.4.1 - Low Complexity Communication Codec plus + * https://www.etsi.org/deliver/etsi_ts/103600_103699/103634/01.04.01_60/ts_103634v010401p.pdf + * LC3plus conformance script package + */ + +#include "libavcodec/packet.h" +#include "libavutil/intreadwrite.h" + +#include "avformat.h" +#include "avio.h" +#include "demux.h" +#include "internal.h" + +typedef struct LC3DemuxContext { + int frame_samples; +} LC3DemuxContext; + +static int lc3_read_header(AVFormatContext *s) +{ + LC3DemuxContext *lc3 = s->priv_data; + AVStream *st = NULL; + uint16_t tag, hdr_size; + uint16_t frame_10us; + uint32_t length; + int ep_mode, hr_mode; + int srate_hz, channels, bit_rate; + int num_extra_params, ret; + + tag = avio_rb16(s->pb); + hdr_size = avio_rl16(s->pb); + + if (tag != 0x1ccc || hdr_size < 9 * sizeof(uint16_t)) + return AVERROR_INVALIDDATA; + + num_extra_params = hdr_size / sizeof(uint16_t) - 9; + + srate_hz = avio_rl16(s->pb) * 100; + bit_rate = avio_rl16(s->pb) * 100; + channels = avio_rl16(s->pb); + frame_10us = avio_rl16(s->pb); + ep_mode = avio_rl16(s->pb) != 0; + length = avio_rl32(s->pb); + hr_mode = num_extra_params >= 1 && avio_rl16(s->pb); + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + avpriv_set_pts_info(st, 64, 1, srate_hz); + st->duration = length; + + st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; + st->codecpar->codec_id = AV_CODEC_ID_LC3; + st->codecpar->sample_rate = srate_hz; + st->codecpar->bit_rate = bit_rate; + st->codecpar->ch_layout.nb_channels = channels; + + if ((ret = ff_alloc_extradata(st->codecpar, 10)) < 0) { + av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n"); + return ret; + } + + AV_WL16(st->codecpar->extradata + 0, frame_10us); + AV_WL16(st->codecpar->extradata + 2, ep_mode); + AV_WL16(st->codecpar->extradata + 4, hr_mode); + AV_WL32(st->codecpar->extradata + 6, length); + + lc3->frame_samples = av_rescale(frame_10us, srate_hz, 100*1000); + + return 0; +} + +static int lc3_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + LC3DemuxContext *lc3 = s->priv_data; + AVIOContext *pb = s->pb; + int64_t pos = avio_tell(pb); + int ret; + + ret = av_get_packet(s->pb, pkt, avio_rl16(pb)); + if (ret < 0) + return ret; + + pkt->pos = pos; + pkt->duration = lc3->frame_samples; + + return 0; +} + +const FFInputFormat ff_lc3_demuxer = { + .p.name = "lc3", + .p.long_name = NULL_IF_CONFIG_SMALL("LC3 (Low Complexity Communication Codec)"), + .p.extensions = "lc3", + .p.flags = AVFMT_GENERIC_INDEX, + .priv_data_size = sizeof(LC3DemuxContext), + .read_header = lc3_read_header, + .read_packet = lc3_read_packet, +}; diff --git a/libavformat/lc3enc.c b/libavformat/lc3enc.c new file mode 100644 index 0000000000..e768212f63 --- /dev/null +++ b/libavformat/lc3enc.c @@ -0,0 +1,100 @@ +/* + * LC3 muxer + * Copyright (C) 2024 Antoine Soulier + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Based on the file format specified by : + * + * - Bluetooth SIG - Low Complexity Communication Codec Test Suite + * https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=502301 + * 3.2.8.2 Reference LC3 Codec Bitstream Format + * + * - ETSI TI 103 634 V1.4.1 - Low Complexity Communication Codec plus + * https://www.etsi.org/deliver/etsi_ts/103600_103699/103634/01.04.01_60/ts_103634v010401p.pdf + * LC3plus conformance script package + */ + +#include "libavutil/intreadwrite.h" + +#include "avformat.h" +#include "avio.h" +#include "mux.h" +#include "internal.h" + +static av_cold int lc3_init(AVFormatContext *s) +{ + if (s->nb_streams != 1) { + av_log(s, AV_LOG_ERROR, "This muxer only supports a single stream.\n"); + return AVERROR(EINVAL); + } + + return 0; +} + +static int lc3_write_header(AVFormatContext *s) +{ + AVStream *st = s->streams[0]; + int channels = st->codecpar->ch_layout.nb_channels; + int srate_hz = st->codecpar->sample_rate; + int bit_rate = st->codecpar->bit_rate; + int frame_us, ep_mode, hr_mode; + uint32_t nb_samples = av_rescale_q( + st->duration, st->time_base, (AVRational){ 1, srate_hz }); + + if (st->codecpar->extradata_size < 6) + return AVERROR_INVALIDDATA; + + frame_us = AV_RL16(st->codecpar->extradata + 0) * 10; + ep_mode = AV_RL16(st->codecpar->extradata + 2) != 0; + hr_mode = AV_RL16(st->codecpar->extradata + 4) != 0; + + avio_wb16(s->pb, 0x1ccc); + avio_wl16(s->pb, (9 + hr_mode) * sizeof(uint16_t)); + avio_wl16(s->pb, srate_hz / 100); + avio_wl16(s->pb, bit_rate / 100); + avio_wl16(s->pb, channels); + avio_wl16(s->pb, frame_us / 10); + avio_wl16(s->pb, ep_mode); + avio_wl32(s->pb, nb_samples); + if (hr_mode) + avio_wl16(s->pb, hr_mode); + + return 0; +} + +static int lc3_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + avio_wl16(s->pb, pkt->size); + avio_write(s->pb, pkt->data, pkt->size); + return 0; +} + +const FFOutputFormat ff_lc3_muxer = { + .p.name = "lc3", + .p.long_name = NULL_IF_CONFIG_SMALL("LC3 (Low Complexity Communication Codec)"), + .p.extensions = "lc3", + .p.audio_codec = AV_CODEC_ID_LC3, + .p.video_codec = AV_CODEC_ID_NONE, + .p.flags = AVFMT_NOTIMESTAMPS, + .init = lc3_init, + .write_header = lc3_write_header, + .write_packet = lc3_write_packet, +};